1.Explore the type of symmetry that each organism has.
a. The crayfish, and the pig have one line of symmetry: Bilateral
b. The starfish has five lines of symmetry: Bilateral
2. Label a picture of the organism with these terms: anterior, posterior, dorsal, ventral, lateral, head, thorax, abdomen.
3.What is the advantage of various structures found on the body such as appendages, mouth parts, sensory antennae, skin receptors, etc. Discuss all the different types of receptors
There are many advantages of various structures found on the body such as appendages, mouth parts, sensory antennae, skin receptors, etc. Appendages are found on the body structures. Examples of appendages are legs, feet, and toe nails. With the crayfish and the fetal pig they use there legs to walk around to get where they want to go. A crayfish has a tail which helps the crayfish to move throughout the water. They also have claws to grab food and to protect them from other predators. A starfish has "tube feet" which suctions them onto to the rocks and allows them to get food from the water that filters through. When animals want to eat they use there mouths. The food in various parts of the body and goes into the digestive system. The mouth on all of the various animals are very important. Crayfish are the only animals out of all three that have sensory antennae. The antennae helps the crayfish be able to find its way around and choose what food it wants to eat and it also helps the crayfish see what is going on by feeling with its antennae. The pig has skin receptors which have five different senses such as touch, pain, heat, cold, and also pressure. The skin receptors help the pig be able to feel whether its in water or mud.
My question is why do starfish have tube feet? Do they help the starfish?
The water vascular system has many things such as the one I am going to talk about is tube feet. It is on the ventral face of the arms of the starfish. It is a function in locomotion and and aid with feedings. Tube feed emerge through the openings of the endoskeleton and impress through the grooves of the bottom of each arm.
Resource: http://en.wikipedia.org/wiki/Starfish
There are many advantages of various structures found on the body such as appendages, mouth parts, sensory antennae, skin receptors, etc. Appendages are found on the body structures. Examples of appendages are legs, feet, and toe nails. With the crayfish and the fetal pig they use there legs to walk around to get where they want to go. A crayfish has a tail which helps the crayfish to move throughout the water. They also have claws to grab food and to protect them from other predators. A starfish has "tube feet" which suctions them onto to the rocks and allows them to get food from the water that filters through. When animals want to eat they use there mouths. The food in various parts of the body and goes into the digestive system. The mouth on all of the various animals are very important. Crayfish are the only animals out of all three that have sensory antennae. The antennae helps the crayfish be able to find its way around and choose what food it wants to eat and it also helps the crayfish see what is going on by feeling with its antennae. The pig has skin receptors which have five different senses such as touch, pain, heat, cold, and also pressure. The skin receptors help the pig be able to feel whether its in water or mud.
My question is why do starfish have tube feet? Do they help the starfish?
The water vascular system has many things such as the one I am going to talk about is tube feet. It is on the ventral face of the arms of the starfish. It is a function in locomotion and and aid with feedings. Tube feed emerge through the openings of the endoskeleton and impress through the grooves of the bottom of each arm.
Resource:
http://en.wikipedia.org/wiki/Starfish